Citibank — automatic submission of credit card application

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I received an email from citibank on 16-dec-2017, that i had applied for citibank rewards card (Ref no. [protected]), which was rejected "as the application did not meet their internal credit acceptance parameters". However, i never applied for any card any time, neither did i open any new bank account with citibank recently. I hold only one citibank account and that too was opened 10 years back.

I called up the customer care, and i was told that i "might" have accidentally clicked some link while browsing some website. How can that be possible? Just clicking a link accidentally does not submit a whole application automatically... There is a whole form to fill with address/ phone number etc., and i would have known if i had filled these details anywhere, which i never filled. I was repeatedly told that i might have accidentally clicked some link and since i did not submit the documents that is why the application was rejected. But that is not what my complaint was about. Firstly, i never submitted or opened any application... Secondly, i never clicked any link accidentally.

Pls. Help me in this regard. The email cited ref no. [protected].